Cleaned up mesh reading
Added spaceship model
Added sky renderer
Scene graph walking for renderables, gui WidgetSkins.
Merge remote-tracking branch 'v0rtex/master'

Conflicts:
	src/render/deferred/DeferredRenderer.cpp
	src/scene/DebugScene.cpp
Added new FindAlure.cmake
Merge branch 'master' of github.com:svenstaro/arkenon
Converted tabs to spaces
added sample music
implemented sound streaming